//import javax.servlet.ServletException;
//import javax.servlet.http.HttpServlet;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
//import javax.servlet.http.HttpSession;
//import java.io.IOException;
//import java.io.PrintWriter;
//
//public class SessionServlet extends HttpServlet {
//  public void doGet(HttpServletRequest request, HttpServletResponse response)
//    throws ServletException, IOException {
//    System.out.println("SessionServlet -- service");
//    response.setContentType("text/html");
//    PrintWriter out = response.getWriter();
//    out.println("<html>");
//    out.println("<head><title>SessionServlet</title></head>");
//    out.println("<body>");
//    String value = request.getParameter("value");
//    HttpSession session = request.getSession(true);
//    out.println("<br>the previous value is " +
//      (String) session.getAttribute("value"));
//    out.println("<br>the current value is " + value);
//    session.setAttribute("value", value);
//    out.println("<br><hr>");
//    out.println("<form>");
//    out.println("New Value: <input name=value>");
//    out.println("<input type=submit>");
//    out.println("</form>");
//    out.println("</body>");
//    out.println("</html>");
//  }
//}
